Fill in the blanks.
The ratio of adults to children is 1 : 2.
The ratio of girls to boys is 7 : 12.
Use LCM and find the following.
- Number of adults = _____ u
- Number of girls = _____ u
- Difference in the number of boys and girls = _____ u
- Total number of people = _____ u
Adults |
Children |
1x19 = 19 u |
2x19 = 38 u |
|
Girls |
Boys |
19 |
7x2 |
12x2 |
19 u |
14 u |
24 u |
(a)
Change ratio into units.
Girls : Boys : Children
7 : 12 : 7 + 12
7 : 12 : 19
The number of children is the repeated identity.
LCM of 2 and 19 is 38.
Number of adults = 19 u
(b)
Number of girls = 14 u
(c)
Difference in the number of boys and girls
= 24 u - 14 u
= 10 u
(d)
Total number of people
= 19 u + 38 u
= 57 u
Answer(s): (a) 19; (b) 14; (c) 10; (d) 57